Well i ride a k4 600 and the bike has stock gearing and a 3 month old back tire. When in first gear at 7k rpm and i try to clutch it up the bike will just spin the back tire if the road surface is too 'slick' and by slick i mean it likes to do this almost anywhere unless its a coarse road/ parking lot surface. My tire pressure is at 28 psi and it still does it. I think my suspension is too stiff maybe? I really just don't like the spinning thing. Its sketchy. Help!!